The Mac app Arc set out to re-invent the web browser as an “internet computer” app – something which felt more personal and usable than mainstream browsers.Less than two years later, the company has announced that it’s discontinuing Arc in favor of a new app – Dia – which it is also pitching as the future of internet usage …Arc may not have challenged the market leaders like Chrome and Safari, but it had generated a loyal and enthusiastic user base on the Mac. The company’s original goal seemed very much in line with the Mac ethos.